#include <iostream>
#include <pv/clientFactory.h>
#include <pv/pvAccess.h>

#include <stdio.h>
#include <epicsStdlib.h>
#include <epicsGetopt.h>
#include <epicsThread.h>
#include <pv/logger.h>
#include <pv/lock.h>

#include <vector>
#include <string>
#include <istream>
#include <fstream>
#include <sstream>

#include <pv/event.h>
#include <epicsExit.h>

#include "pvutils.cpp"

#include <pv/caProvider.h>

using namespace std;
namespace TR1 = std::tr1;
using namespace epics::pvData;
using namespace epics::pvAccess;






#define DEFAULT_TIMEOUT 3.0
#define DEFAULT_REQUEST "field(value)"
#define DEFAULT_PROVIDER "pva"

double timeOut = DEFAULT_TIMEOUT;
string request(DEFAULT_REQUEST);
string defaultProvider(DEFAULT_PROVIDER);
const string noAddress;

enum PrintMode { ValueOnlyMode, StructureMode, TerseMode };
PrintMode mode = ValueOnlyMode;

char fieldSeparator = ' ';

void usage (void)
{
    fprintf (stderr, "\nUsage: pvget [options] <PV name>...\n\n"
             "  -h: Help: Print this message\n"
             "  -v: Print version and exit\n"
             "\noptions:\n"
             "  -r <pv request>:   Request, specifies what fields to return and options, default is '%s'\n"
             "  -w <sec>:          Wait time, specifies timeout, default is %f second(s)\n"
             "  -t:                Terse mode - print only value, without names\n"
             "  -i:                Do not format standard types (enum_t, time_t, ...)\n"
             "  -m:                Monitor mode\n"
             "  -p <provider>:     Set default provider name, default is '%s'\n"
             "  -q:                Quiet mode, print only error messages\n"
             "  -d:                Enable debug output\n"
             "  -F <ofs>:          Use <ofs> as an alternate output field separator\n"
             "  -f <input file>:   Use <input file> as an input that provides a list PV name(s) to be read, use '-' for stdin\n"
             "  -c:                Wait for clean shutdown and report used instance count (for expert users)\n"
             " enum format:\n"
             "  -n: Force enum interpretation of values as numbers (default is enum string)\n"
//    " time format:\n"
//    "  -u: print userTag\n"
             "\nexample: pvget double01\n\n"
             , DEFAULT_REQUEST, DEFAULT_TIMEOUT, DEFAULT_PROVIDER);
}

void printValue(std::string const & channelName, PVStructure::shared_pointer const & pv)
{
    if (mode == ValueOnlyMode)
    {
        PVField::shared_pointer value = pv->getSubField("value");
        if (value.get() == 0)
        {
            std::cerr << "no 'value' field" << std::endl;
            //std::cout << channelName << std::endl << *(pv.get()) << std::endl << std::endl;
            pvutil_ostream myos(std::cout.rdbuf());
            myos << channelName << std::endl << *(pv.get()) << std::endl << std::endl;
        }
        else
        {
            Type valueType = value->getField()->getType();
            if (valueType != scalar && valueType != scalarArray)
            {
                // switch to structure mode, unless it's T-type
                if (valueType == structure && isTType(TR1::static_pointer_cast<PVStructure>(value)))
                {
                    std::cout << std::setw(30) << std::left << channelName;
                    std::cout << fieldSeparator;
                    formatTType(std::cout, TR1::static_pointer_cast<PVStructure>(value));
                    std::cout << std::endl;
                }
                else
                {
                    //std::cout << channelName << std::endl << *(pv.get()) << std::endl << std::endl;
                    pvutil_ostream myos(std::cout.rdbuf());
                    myos << channelName << std::endl << *(pv.get()) << std::endl << std::endl;
                }
            }
            else
            {
                if (fieldSeparator == ' ' && value->getField()->getType() == scalar)
                    std::cout << std::setw(30) << std::left << channelName;
                else
                    std::cout << channelName;

                std::cout << fieldSeparator;

                terse(std::cout, value) << std::endl;
            }
        }
    }
    else if (mode == TerseMode)
        terseStructure(std::cout, pv) << std::endl;
    else
    {
        //std::cout << channelName << std::endl << *(pv.get()) << std::endl << std::endl;
        pvutil_ostream myos(std::cout.rdbuf());
        myos << channelName << std::endl << *(pv.get()) << std::endl << std::endl;
    }
}


class ChannelGetRequesterImpl : public ChannelGetRequester
{
private:
    PVStructure::shared_pointer m_pvStructure;
    BitSet::shared_pointer m_bitSet;
    Mutex m_pointerMutex;
    Event m_event;
    string m_channelName;

    bool m_done;

public:

    ChannelGetRequesterImpl(std::string channelName) : m_channelName(channelName), m_done(false) {}

    virtual string getRequesterName()
    {
        return "ChannelGetRequesterImpl";
    }

    virtual void message(std::string const & message, MessageType messageType)
    {
        std::cerr << "[" << getRequesterName() << "] message(" << message << ", " << getMessageTypeName(messageType) << ")" << std::endl;
    }

    virtual void channelGetConnect(const epics::pvData::Status& status, ChannelGet::shared_pointer const & channelGet,
                                   epics::pvData::Structure::const_shared_pointer const & /*structure*/)
    {
        if (status.isSuccess())
        {
            // show warning
            if (!status.isOK())
            {
                std::cerr << "[" << m_channelName << "] channel get create: " << status << std::endl;
            }

            channelGet->lastRequest();
            channelGet->get();
        }
        else
        {
            std::cerr << "[" << m_channelName << "] failed to create channel get: " << status << std::endl;
            m_event.signal();
        }
    }

    virtual void getDone(const epics::pvData::Status& status,
                         ChannelGet::shared_pointer const & /*channelGet*/,
                         epics::pvData::PVStructure::shared_pointer const & pvStructure,
                         epics::pvData::BitSet::shared_pointer const & bitSet)
    {
        if (status.isSuccess())
        {
            // show warning
            if (!status.isOK())
            {
                std::cerr << "[" << m_channelName << "] channel get: " << status << std::endl;
            }

            // access smart pointers
            {
                Lock lock(m_pointerMutex);

                m_pvStructure = pvStructure;
                m_bitSet = bitSet;

                m_done = true;

            }
        }
        else
        {
            std::cerr << "[" << m_channelName << "] failed to get: " << status << std::endl;
        }

        m_event.signal();
    }

    PVStructure::shared_pointer getPVStructure()
    {
        Lock lock(m_pointerMutex);
        return m_pvStructure;
    }

    bool waitUntilGet(double timeOut)
    {
        bool signaled = m_event.wait(timeOut);
        if (!signaled)
        {
            std::cerr << "[" << m_channelName << "] get timeout" << std::endl;
            return false;
        }

        Lock lock(m_pointerMutex);
        return m_done;
    }
};

class MonitorRequesterImpl : public MonitorRequester
{
private:

    string m_channelName;

public:

    MonitorRequesterImpl(std::string channelName) : m_channelName(channelName) {};

    virtual string getRequesterName()
    {
        return "MonitorRequesterImpl";
    };

    virtual void message(std::string const & message,MessageType messageType)
    {
        std::cerr << "[" << getRequesterName() << "] message(" << message << ", " << getMessageTypeName(messageType) << ")" << std::endl;
    }

    virtual void monitorConnect(const epics::pvData::Status& status, Monitor::shared_pointer const & monitor, StructureConstPtr const & /*structure*/)
    {
        if (status.isSuccess())
        {
            /*
            string str;
            structure->toString(&str);
            std::cout << str << std::endl;
            */

            Status startStatus = monitor->start();
            // show error
            // TODO and exit
            if (!startStatus.isSuccess())
            {
                std::cerr << "[" << m_channelName << "] channel monitor start: " << startStatus << std::endl;
            }

        }
        else
        {
            std::cerr << "monitorConnect(" << status << ")" << std::endl;
        }
    }

    virtual void monitorEvent(Monitor::shared_pointer const & monitor)
    {

        MonitorElement::shared_pointer element;
        while ((element = monitor->poll()))
        {
            if (mode == ValueOnlyMode)
            {
                PVField::shared_pointer value = element->pvStructurePtr->getSubField("value");
                if (value.get() == 0)
                {
                    std::cerr << "no 'value' field" << std::endl;
                    std::cout << m_channelName << std::endl;
                    //std::cout << *(element->pvStructurePtr.get()) << std::endl << std::endl;
                    pvutil_ostream myos(std::cout.rdbuf());
                    myos << *(element->pvStructurePtr.get()) << std::endl << std::endl;
                }
                else
                {
                    Type valueType = value->getField()->getType();
                    if (valueType != scalar && valueType != scalarArray)
                    {
                        // switch to structure mode, unless it's T-type
                        if (valueType == structure && isTType(TR1::static_pointer_cast<PVStructure>(value)))
                        {
                            std::cout << std::setw(30) << std::left << m_channelName;
                            std::cout << fieldSeparator;
                            formatTType(std::cout, TR1::static_pointer_cast<PVStructure>(value));
                            std::cout << std::endl;
                        }
                        else
                        {
                            std::cout << m_channelName << std::endl;
                            //std::cout << *(element->pvStructurePtr.get()) << std::endl << std::endl;
                            pvutil_ostream myos(std::cout.rdbuf());
                            myos << *(element->pvStructurePtr.get()) << std::endl << std::endl;
                        }
                    }
                    else
                    {
                        if (fieldSeparator == ' ' && value->getField()->getType() == scalar)
                            std::cout << std::setw(30) << std::left << m_channelName;
                        else
                            std::cout << m_channelName;

                        std::cout << fieldSeparator;

                        terse(std::cout, value) << std::endl;
                    }
                }
            }
            else if (mode == TerseMode)
            {
                if (fieldSeparator == ' ')
                    std::cout << std::setw(30) << std::left << m_channelName;
                else
                    std::cout << m_channelName;

                std::cout << fieldSeparator;

                terseStructure(std::cout, element->pvStructurePtr) << std::endl;
            }
            else
            {
                std::cout << m_channelName << std::endl;
                //std::cout << *(element->pvStructurePtr.get()) << std::endl << std::endl;
                pvutil_ostream myos(std::cout.rdbuf());
                myos << *(element->pvStructurePtr.get()) << std::endl << std::endl;
            }

            monitor->release(element);
        }

    }

    virtual void unlisten(Monitor::shared_pointer const & /*monitor*/)
    {
        std::cerr << "unlisten" << std::endl;
    }
};



/*+**************************************************************************
 *
 * Function:	main
 *
 * Description:	pvget main()
 * 		Evaluate command line options, set up PVA, connect the
 * 		channels, print the data as requested
 *
 * Arg(s) In:	[options] <pv-name>...
 *
 * Arg(s) Out:	none
 *
 * Return(s):	Standard return code (0=success, 1=error)
 *
 **************************************************************************-*/

int main (int argc, char *argv[])
{
    int opt;                    /* getopt() current option */
    bool debug = false;
    bool cleanupAndReport = false;
    bool monitor = false;
    bool quiet = false;

    istream* inputStream = 0;
    ifstream ifs;
    bool fromStream = false;

    setvbuf(stdout,NULL,_IOLBF,BUFSIZ);    /* Set stdout to line buffering */

    while ((opt = getopt(argc, argv, ":hvr:w:tmp:qdcF:f:ni")) != -1) {
        switch (opt) {
        case 'h':               /* Print usage */
            usage();
            return 0;
        case 'v':               /* Print version */
        {
            Version version("pvget", "cpp",
                    EPICS_PVA_MAJOR_VERSION,
                    EPICS_PVA_MINOR_VERSION,
                    EPICS_PVA_MAINTENANCE_VERSION,
                    EPICS_PVA_DEVELOPMENT_FLAG);
            fprintf(stdout, "%s\n", version.getVersionString().c_str());
            return 0;
        }
        case 'w':               /* Set PVA timeout value */
            if((epicsScanDouble(optarg, &timeOut)) != 1 || timeOut <= 0.0)
            {
                fprintf(stderr, "'%s' is not a valid timeout value "
                        "- ignored. ('pvget -h' for help.)\n", optarg);
                timeOut = DEFAULT_TIMEOUT;
            }
            break;
        case 'r':               /* Set PVA timeout value */
            request = optarg;
            // do not override terse mode
            if (mode == ValueOnlyMode) mode = StructureMode;
            break;
        case 't':               /* Terse mode */
            mode = TerseMode;
            break;
        case 'i':               /* T-types format mode */
            formatTTypes(false);
            break;
        case 'm':               /* Monitor mode */
            monitor = true;
            break;
        case 'p':               /* Set default provider */
            defaultProvider = optarg;
            break;
        case 'q':               /* Quiet mode */
            quiet = true;
            break;
        case 'd':               /* Debug log level */
            debug = true;
            break;
        case 'c':               /* Clean-up and report used instance count */
            cleanupAndReport = true;
            break;
        case 'F':               /* Store this for output formatting */
            fieldSeparator = (char) *optarg;
            break;
        case 'f':               /* Use input stream as input */
        {
            string fileName = optarg;
            if (fileName == "-")
                inputStream = &cin;
            else
            {
                ifs.open(fileName.c_str(), ifstream::in);
                if (!ifs)
                {
                    fprintf(stderr,
                            "Failed to open file '%s'.\n",
                            fileName.c_str());
                    return 1;
                }
                else
                    inputStream = &ifs;
            }

            fromStream = true;
            break;
        }
        case 'n':
            setEnumPrintMode(NumberEnum);
            break;
        case '?':
            fprintf(stderr,
                    "Unrecognized option: '-%c'. ('pvget -h' for help.)\n",
                    optopt);
            return 1;
        case ':':
            fprintf(stderr,
                    "Option '-%c' requires an argument. ('pvget -h' for help.)\n",
                    optopt);
            return 1;
        default :
            usage();
            return 1;
        }
    }

    int nPvs = argc - optind;       /* Remaining arg list are PV names */
    if (nPvs > 0)
    {
        // do not allow reading file and command line specified pvs
        fromStream = false;
    }
    else if (nPvs < 1 && !fromStream)
    {
        fprintf(stderr, "No pv name(s) specified. ('pvget -h' for help.)\n");
        return 1;
    }

    vector<string> pvs;     /* Array of PV structures */
    if (fromStream)
    {
        string cn;
        while (true)
        {
            *inputStream >> cn;
            if (!(*inputStream))
                break;
            pvs.push_back(cn);
        }

        // set nPvs
        nPvs = pvs.size();
    }
    else
    {
        // copy PV names from command line
        for (int n = 0; optind < argc; n++, optind++)
            pvs.push_back(argv[optind]);
    }


    SET_LOG_LEVEL(debug ? logLevelDebug : logLevelError);

    std::cout << std::boolalpha;
    terseSeparator(fieldSeparator);

    bool allOK = true;

    {
        Requester::shared_pointer requester(new RequesterImpl("pvget"));

        PVStructure::shared_pointer pvRequest = CreateRequest::create()->createRequest(request);
        if(pvRequest.get()==NULL) {
            fprintf(stderr, "failed to parse request string\n");
            return 1;
        }

        std::vector<std::string> pvNames;
        std::vector<std::string> pvAddresses;
        std::vector<std::string> providerNames;

        pvNames.reserve(nPvs);
        pvAddresses.reserve(nPvs);
        providerNames.reserve(nPvs);

        for (int n = 0; n < nPvs; n++)
        {
            URI uri;
            bool validURI = URI::parse(pvs[n], uri);

            std::string providerName(defaultProvider);
            std::string pvName(pvs[n]);
            std::string address(noAddress);
            bool usingDefaultProvider = true;
            if (validURI)
            {
                if (uri.path.length() <= 1)
                {
                    std::cerr << "invalid URI '" << pvs[n] << "', empty path" << std::endl;
                    return 1;
                }
                providerName = uri.protocol;
                pvName = uri.path.substr(1);
                address = uri.host;
                usingDefaultProvider = false;
            }

            if ((providerName != "pva") && (providerName != "ca"))
            {
                std::cerr << "invalid "
                          << (usingDefaultProvider ? "default provider" : "URI scheme")
                          << " '" << providerName
                          << "', only 'pva' and 'ca' are supported" << std::endl;
                return 1;
            }
            pvNames.push_back(pvName);
            pvAddresses.push_back(address);
            providerNames.push_back(providerName);
        }

        ClientFactory::start();
        epics::pvAccess::ca::CAClientFactory::start();

        // first connect to all, this allows resource (e.g. TCP connection) sharing
        vector<Channel::shared_pointer> channels(nPvs);
        for (int n = 0; n < nPvs; n++)
        {
            TR1::shared_ptr<ChannelRequesterImpl> channelRequesterImpl(new ChannelRequesterImpl(quiet));
            if (pvAddresses[n].empty())
                channels[n] = getChannelProviderRegistry()->getProvider(
                                  providerNames[n])->createChannel(pvNames[n], channelRequesterImpl);
            else
                channels[n] = getChannelProviderRegistry()->getProvider(
                                  providerNames[n])->createChannel(pvNames[n], channelRequesterImpl,
                                          ChannelProvider::PRIORITY_DEFAULT, pvAddresses[n]);
        }

        // for now a simple iterating sync implementation, guarantees order
        for (int n = 0; n < nPvs; n++)
        {
            Channel::shared_pointer channel = channels[n];
            TR1::shared_ptr<ChannelRequesterImpl> channelRequesterImpl = TR1::dynamic_pointer_cast<ChannelRequesterImpl>(channel->getChannelRequester());

            if (channelRequesterImpl->waitUntilConnected(timeOut))
            {
                TR1::shared_ptr<GetFieldRequesterImpl> getFieldRequesterImpl;

                // probe for value field
                if (mode == ValueOnlyMode)
                {
                    getFieldRequesterImpl.reset(new GetFieldRequesterImpl(channel));
                    // get all to be immune to bad clients not supporting selective getField request
                    channel->getField(getFieldRequesterImpl, "");
                }

                if (getFieldRequesterImpl.get() == 0 ||
                        getFieldRequesterImpl->waitUntilFieldGet(timeOut))
                {
                    // check probe
                    if (getFieldRequesterImpl.get())
                    {
                        Structure::const_shared_pointer structure =
                            TR1::dynamic_pointer_cast<const Structure>(getFieldRequesterImpl->getField());
                        if (structure.get() == 0 || structure->getField("value").get() == 0)
                        {
                            // fallback to structure
                            mode = StructureMode;
                            pvRequest = CreateRequest::create()->createRequest("field()");
                        }
                    }

                    if (!monitor)
                    {
                        TR1::shared_ptr<ChannelGetRequesterImpl> getRequesterImpl(new ChannelGetRequesterImpl(channel->getChannelName()));
                        ChannelGet::shared_pointer channelGet = channel->createChannelGet(getRequesterImpl, pvRequest);
                        allOK &= getRequesterImpl->waitUntilGet(timeOut);
                        if (allOK)
                            printValue(channel->getChannelName(), getRequesterImpl->getPVStructure());
                    }
                    else
                    {
                        TR1::shared_ptr<ChannelRequesterImpl> channelRequesterImpl = TR1::dynamic_pointer_cast<ChannelRequesterImpl>(channel->getChannelRequester());
                        channelRequesterImpl->showDisconnectMessage();

                        TR1::shared_ptr<MonitorRequesterImpl> monitorRequesterImpl(new MonitorRequesterImpl(channel->getChannelName()));
                        Monitor::shared_pointer monitorGet = channel->createMonitor(monitorRequesterImpl, pvRequest);
                        allOK &= true;
                    }
                }
                else
                {
                    allOK = false;
                    channel->destroy();
                    std::cerr << "[" << channel->getChannelName() << "] failed to get channel introspection data" << std::endl;
                }
            }
            else
            {
                allOK = false;
                channel->destroy();
                std::cerr << "[" << channel->getChannelName() << "] connection timeout" << std::endl;
            }
        }

        if (allOK && monitor)
        {
            while (true)
                epicsThreadSleep(timeOut);
        }

        epics::pvAccess::ca::CAClientFactory::stop();
        ClientFactory::stop();
    }

    if (cleanupAndReport)
    {
        // TODO implement wait on context
        epicsThreadSleep ( 3.0 );
        //std::cout << "-----------------------------------------------------------------------" << std::endl;
        //epicsExitCallAtExits();
    }

    return allOK ? 0 : 1;
}